CyberHunter
Local dataset, no network
// Other services

Port 998:

Port 998 is assigned by IANA to busboy (), puparp ().

998

How busboy works

Other services
client:998busboyresponse client:998busboyresponse

The client sends a request to port 998 and the busboy service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 998 dangerous?

We have no specific security note for port 998. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 998

ServicePortTransportDescriptionReferenceUpdated
busboy 998 TCP - -
puparp 998 UDP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 998, and is it reachable?

Linux

sudo ss -ltnup 'sport = :998'      # process listening on 998
sudo lsof -nP -i :998

macOS

sudo lsof -nP -i :998

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 998 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 998
netstat -ano | findstr :998

From another machine

nmap -p 998 -sV <host>
sudo nmap -sU -p 998 <host>
nc -zv <host> 998

Block it in the firewall

sudo ufw deny 998/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 998" -Direction Inbound -LocalPort 998 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 998 used for?

Port 998 is assigned by IANA to busboy (), puparp ().

Is port 998 TCP or UDP?

Port 998 is registered for TCP and UDP.

Is it safe to open port 998?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 998 is open?

On Linux run "ss -ltnup 'sport = :998'", on macOS "lsof -nP -i :998", and on Windows "netstat -ano | findstr :998" to see the local process. From another machine, "nmap -p 998 <host>" shows whether it is reachable.

05 Related
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